#include <stdio.h>
/**
Input://end with EOF(Ctrl+Z) or 0 0
1 2
3 4
0 0
Output
3
7
*/
int main(){
  int a, b;
  while (2 == scanf("%d%d", &a, &b)){
    if (a == 0 && b == 0)
      break;
    printf("%d\n", a + b);
  }
  return 0;
}
